Discover Knack's range of patented expandable travel bags, perfect for both traveling for a weekend getaway as well as daily commuting. Our collection includes expandable backpacks in various sizes and colors. Built to fit under an airplane seat or in the overhead bin, a Knack expandable bag adapts to whatever your day demands. 

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Expandable Travel Bag Collection

Explore Knack’s Expandable Travel Bag Collection, with options for travel, work, and daily life. Each bag transitions from an everyday backpack into an expandable travel bag, giving you ample space when your packing needs change. Whether you’re heading out for a weekend trip or an extended journey, there’s a style to fit the way you travel, including expandable backpacks, duffel bags, and duffels.

Our expandable carry-on bags combine sleek, professional style with durable material and water-resistant construction. Thoughtful organization pockets keep tech, toiletries, accessories, and a packing cube within easy reach, while flexible designs help maximize space without sacrificing comfort. Find the expandable bag that fits your travel style and packing needs.

Expandable Travel Bag Features

  • Series 2: Large Expandable Knack Pack Backpack Knack#color_midnight-black

    Expand Your Horizons

    Separate, patented, expandable suitcase compartment makes packing for travel easy by giving you 45% more carrying capacity. Easily access multiple changes of clothes with a convenient suitcase lid.

  • Business Trip Travel Set Series 2 Backpack Knack

    Stay Organized

    Keep all your gear secure and easy to find with next-level organization, including everything from fleece and mesh accessory pockets to a hidden side-zip water bottle pocket and a padded laptop pocket.

  • Be Compatible

    To make your travels easier, our hidden trolley sleeve lets you slip your Knack over the handle of almost all sizes of wheeled luggage.
Knack Backpacks Travel Everyday Commute Backpack

About Knack

Knack sprang from the simple observation that too many people were carrying too many bags at the same time. This aha moment spurred our passion to live a One Bag Life. So we pulled together a dedicated group of frequent travelers and bag enthusiasts––from Tumi, Coach, North Face, Samsonite, and eBags––to create the one bag that’s clever enough to replace two.

Expandable Bags FAQs

How much extra space do I get when I expand a Knack Pack?

The amount of extra space depends on the size and model you choose. Knack Pack expandable sections typically increase capacity by about 40–45%. For example, the Series 2 Medium expands from 24L to 35L, giving you more room for clothes, gear, or souvenirs on a weekend trip or longer journey.
Are expandable backpacks good for weekend trips?

Yes. An expandable backpack gives you the flexibility to use one bag for both everyday carry and short trips. Keep your Knack Pack compressed when you're commuting or working, then expand it when you need room for clothing, toiletries, shoes, or other weekend essentials.
Can an expandable backpack work as both a daily bag and a travel bag?

Yes. Knack Packs are designed to transition from everyday work and commuting to travel by giving you additional packing capacity when you need it. You can carry your laptop and work essentials in the same bag you use for a few days of clothing and personal items.
Can an expandable backpack fit under an airplane seat or in the overhead bin?

It depends on the specific Knack Pack, how much it is expanded, and the airline's size requirements. An expanded bag takes up more depth, so check the dimensions of your specific bag and your airline's carry-on or personal-item requirements before flying. Keeping the bag compressed gives you a slimmer profile when you don't need the extra capacity.

Testimonials

If you travel often or juggle work and life on the go, the Knack Series 2 Backpack (Large) might be the only bag you need.

The expandable main compartment is a game-changer—when zipped out, it easily holds enough clothes for a 3-4 night trip. I packed it for my current trip and was surprised by how much it fit without feeling bulky or overstuffed, and it fit under the plane seat.

Ryan

I'm traveling every week and rely on my bag to hold my gear but also look good in a meeting room. I must have looked at over 400 laptop bags. I even bought a couple of things and had to return them. The Knack is perfect. I love it! I love the pockets, I love the quality, I love the expansion. It's got some thoughtful touches (the mesh pockets let you see everything in them, the key fob is long enough to be useful).

Eric F.

This backpack carries a lot for its size and is very comfortable on the whole... Expansion option adds a lot of flexible storage and does not feel bulky when full.

Christine C.

This is a GREAT EDC bag that is also great for a 2 day trip due to its ability to expand. I’ll tell you what I love about it, then I’ll suggest some areas where I think there’s some opportunity for improvements.

John C.

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